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We report new experimental data on the rotationally resolved room temperature absorption spectrum of CH 2 O in the near infrared (NIR) region between 6804 and 7051 cm  – 1  (1470–1418 nm). Data have been obtained by cavity enhanced absorption spectroscopy and complement the spectrum in the wavelength range 6547–6804 cm  – 1 , obtained using virtually the same experimental set-up and already published in an earlier publication (Staak et al., J. Mol. Spectrosc.  229  (2005) 115–121). Several vibrational combination bands occur in this region and give rise to a congested spectrum and over 4500 lines with cross-sections over 5 · 10  – 23  cm 2  were observed. Recent experimental studies using NIR absorption spectroscopy for quantifying CH 2 O in different chemical systems indicate that the absorption cross-sections obtained by Staak et al. may have been overestimated. The results of these experiments are reviewed here and a recommendation for absolute absorption cross sections of CH 2 O in the NIR range will be given. Absolute absorption cross-sections stated here are corrected by the recommended factor.

The Rotationally-Resolved Absorption Spectrum of Formaldehyde from 6547 to 7051 cm −1

The Rotationally-Resolved Absorption Spectrum of Formaldehyde from 6547 to 7051 cm −1